We saw "Alice In Wonderland" in 3D yesterday, and the movie was quite fun but the 3D was not very good. The 3D experience was noticeably worse than when I saw Avatar in 3D a few months ago, even though I saw both in the same theater and I had a more central seat for Alice than I had for Avatar
Alice in 3D some unpleasant artifacts in some of the darker scenes, particularly falling down the rabbit hole and many interior shots. Any action where an object was supposed to be flying out of the screen or zooming by in the foreground came off as a muddy blur. Just to be sure that it wasn't my 3D glasses, I switched glasses a few times, and both pairs were identically bad in the same scenes. Also, the poor 3D was not universal in the movie: many scenes had depth exactly as one would hope. It seems likely that the Disney/Pixar 3D process is simply worse than that used for Avatar, or didn't do proper quality control on the 3D process throughout the movie .
Having said that, the movie itself was great. The acting was quite good, but the thing that stood out was a very appropriate balance of live action to high-quality animation. I will go to see the 2D version sometime in the next few weeks just to enjoy the movie, but I will probably not bother with any other Pixar 3D movies and hope that they fix their production process.
Update: This article explains why.